ccording to an article the bottled water you are drinking may contain more bacteria and other potentially carcinogenic chemicals than are allowed by state and federal regulations. Of the more than 1100 bottles​ studied, nearly​ one-third exceeded government levels. Suppose that a department wants an updated estimate of the population proportion of bottled water that violates at least one government standard. Determine the sample size​ (number of​ bottles) needed to estimate this proportion to within ±0.02 with​ 99% confidence. The sample size needed to estimate this proportion to within ±0.02 with​ 99% confidence is?

Q: In estimating the population mean with the population standard deviation unknown, if the sample size…

A: Given that, Population standard deviation is unknown and sample size (n) = 27

Q: 2. Researchers wanted to compare the effectiveness of three diet plans. 78 subjects were randomly…

A: VariableDietSample sizeMeanSt DevWeight LossA242.8831.507B273.0262.523C275.1482.396

Q: 60 people are  surveyed  in new  york city .Out of the  60 , 43 people have  corona  infection…

A: Given, Total no. of people surveyed=60 No. of people having corona infection=43 No. of people tested…

Q: Your professor wishes to estimate the proportion of high school students enrolled in college-level…

A: Given: margin of error of 3.5 percent 99% confidenp p= 18.3%

Q: Estimate the chance that the sample proportion was more than 45% using a normal approximation.

A: Given information: Given that , 40 % of the primary doctors have made claim that their patients…

Q: Because of safety considerations, in May 2003, the Federal Aviation Administration (FAA) changed its…

A: Given information: x¯summer=183x¯winter=190nsummer=100=nwinterssummer=21swinter=24 a)…

Q: Anterior cruciate ligament (ACL) injuries occur most frequently in planting and cutting sports such…

A: Consider the variance for women: x¯women=4+3+5+2+45=3.6 swomen2=∑(x-x¯women)2n-1…

Q: The Bureau of Alcohol, Tobacco, and Firearms (BATF) has been concerned about lead levels in…

A: GivenLead levels rangin from 47 to 660Minimum value = 47Maximum value = 660Margin of…

Q: You wish to estimate, with 90% confidence, the proportion of tablet owners who use their tablets…

A: Solution: 1. From the given information, confidence level is 0.90 and E=0.02. Since the proportion…

Q: measurements from this patient is approximately normally distributed. Determine the critical…

A: Given data : 189 186 199 197 190 186 185 200 200 200 185 190

Q: A recent survey in the United States reported the prevalence of a sexually transmitted disease…

A: Given information- Sample proportion, p = 1.7% We have given 95% Confidence interval is = (1.4%,…

Q: According to the American Cancer Society, in 2016 10.7% of the U.S. working population commute to…

A: From the provided information, In 2016, 10.7% of the U.S. working population commute to work by…

Q: Why do you think any serious researcher would use the sample mean to estimate for the population…

A: Generally research is carried out to determine a particularoutcome in the targeted…

Q: In survey of 3005 adults aged 57 through 85 years, if was found that 82% of them used at least one…

A: 1) The population of the provided information is adult aged 57 through 85 year. 2) The sample of the…

Q: In the nation of Gondor, the EPA requires that half the new cars sold will meet a certain…

A: The question is about hypothesis testing.Given :Population proportion of new car will meet a…

Q: A newspaper infographic titled "Have a Nice Trip" summarized data from a survey of 1,000 U.S. adults…

A: The objective of the question is to estimate the population proportion of U.S. adults who have…

Q: Two types of valves are being tested to determine if there is a difference in pressure tolerances.…

A: The objective of this question is to determine if there is a significant difference in the pressure…

Q: Cadmium, a heavy metal, is toxic to animals. Mushrooms, however, are able to absorb and accumulate…

A: The data shows the cadmium concentration of edible mushroom of 12 sample are given.

Q: A school district is considering moving the start of the school day at Groveland High from 8:00 a.m.…

A: The correct option is "option A"  Explanation: The two samples are independent Samples are taken…

Q: You want to obtain a sample to estimate the percentage of college students in the U.S. that get a…

A: It is given that margin of error (E) is 0.03 and the confidence level is 0.95.

Q: Determine the minimum sample size needed if we want to estimate the population percent of students…

A:

Q: A rare birth defect occurs in approximately 0.5% of all cases in males. If we sample all the males…

A: Given information: The total number of males born in 2016 in a specific region is N = 200,000. It is…

Q: Suppose that we wanted to estimate the true average number of eggs a queen bee lays with 99%…

A:

Q: Identify two statistical methods other than a census for obtaining information.

A:

Q: Estimate the Odds ratio, with an associated 95% cI, for the association between exposure to fuel and…

A: Formula of Odds Ratio= For the 2x2 contingency table, Odds Ratio= ad/bc= 56*623/23*253= 5.9955

Q: A cigarette manufacturer claims that his cigarettes have nicotine content that does not exceed 2.0…

A: Introduction: Denote μ as the true mean nicotine content in the cigarettes produced by the given…

Q: The Bureau of Alcohol, Tobacco, and Firearms (BATF) has been concerned about lead levels in…

A: Given, Range = 49 to 720 Margin of Error E = 10 at 90% confidence level  α = 0.1Critical value Zα2 =…

Q: Suppose that you are attempting to estimate the weight of 600 parts. In order to use the infinite…

A:

Q: The American Academy of Pediatrics offers guidelines and recommendations for how much “screen time”…

A: Given data,No of parents n=200proportion of these parents who indicate they follow screen time…

Q: If you want to be 95​% confident of estimating the population proportion to within a sampling error…

A: z-critical value at alpha(0.95) = 1.96 margin of error =0.08   p = 0.5

Q: If the population proportion is 0.7. A researcher wants the margin of error to be 0.20 and the level…

A:

Q: Anterior cruciate ligament (ACL) injuries occur most frequently in planting and cutting sports such…

A: Given Data : Women- 4,3, 5, 2,4 Men-  2, 0, 1 ,2, 1   We have to calculate mean and standard…

Q: Investigators interested in the association between serum vitamin D levels and various birth…

A:

Q: A pool of 500 Houston residents indicated that 16% of them participated in Women’s March on January…

A:

Q: You would like to estimate the proportion of all residents in favor of a new law with 98%…

A: The sample proportion is 0.30, margin of error is 0.06, and the confidence level is 98%. Computation…

Q: Thirty-three percent of all Americans drink bottled water more than once a week (Natural resources…

A: Note: Hi there! Thank you for posting the question. Unfortunately in the sub-part(b), some required…

Q: At the 5% significance level, what is the conclusion to the ANOVA test of mean differences?…

A: Given that,Level of significance To complete the ANOVA table and test the means using F-test.

Q: should their sample size be?

A: here use solvin's formula

2-Proportion Test

In a 2-proportion test, two separate proportions are measured at the same time, and their similarity is evaluated. It is also known as a 2-proportion z-test, and a comparison of two different proportions is done in this method.